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About EPA

About the Great Lakes Toxicology and Ecology Division

On This Page:

What We Do
Our Research


What We Do

The Great Lakes Toxicology & Ecology Division (GLTED) focuses on developing new methods to predict the effect of chemicals on our nation’s freshwater ecosystems. The Division incorporates traditional and predictive toxicity using advanced tools to produce science to inform ecological risk assessments of chemicals by EPA’s Program Offices and Regions.

GLTED primarily focuses on freshwater coastal ecology, linking the ecological integrity of receiving waters to watershed effects, and developing indicators and sampling protocols for freshwater ecosystem assessments. GLTED uses an array of factors to assess and predict outcomes of clean up and revitalization efforts. Intrinsic to this division’s mission is building the functional resiliency of watersheds and coastal systems to human-driven flows of chemicals, sediment, and invasive species. 

Our Research



Dale Hoff, Director

Mary Hautajarvi, Program Operations Staff Chief



  • Ecosystem Services Branch
  • Systems Toxicology Branch
  • Molecular Indicators Branch
  • Translational Toxicology Branch
  • Watersheds and Water Resource Branch


Main Office Location

US EPA ORD Center for Computational Toxicology and Exposure
Great Lakes Toxicology and Ecology Division
6201 Congdon Boulevard
Duluth, MN 55804